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Posted: 3/28/2009 6:28:02 PM EDT
Link Posted: 3/28/2009 6:33:50 PM EDT
Any noticeable problems with the abs?

Going by past experiences I would guess it needs hydraulic control unit, most common cause is sticking isolation valves internal to unit, & cannot be serviced seperately. If you buy oem part from dealer it should come with fluid in unit, so you ca bleed system without ngs, or breaker box. But thats just a guess since I have not tested it.
Link Posted: 3/28/2009 6:33:51 PM EDT
Fuse/power to the pump?

Connections with all wheel speed sensors.

Sensors themselves.

What does the brake fluid look like?
Link Posted: 3/28/2009 6:34:47 PM EDT
Link Posted: 3/28/2009 6:35:39 PM EDT
Link Posted: 3/28/2009 6:37:08 PM EDT
Fuck diagnosing the truck, I do that all week.


Lets see your I tunes list
Link Posted: 3/28/2009 6:37:36 PM EDT
I always start with the simplest explanation , the fuses , then I check the pump to see if it's actually working , work backward from there .

Is there a maintenence switch in the circut ? I know there was a 3 position switch on one car I worked on , the light would come on at certain intervals and wouldn't go out till the mechanic (me) inspected the system and flipped the switch hidden up under the dash . older BMW's had a little rig the mechanic had to reset the computer with . Anything like that going on here perhaps ?
Link Posted: 3/28/2009 6:40:17 PM EDT
Link Posted: 3/28/2009 6:40:30 PM EDT
I'm tired, and I've been drinking. Analytical skills will suffer. Tag for later.
Link Posted: 3/28/2009 6:41:13 PM EDT
Link Posted: 3/28/2009 6:42:49 PM EDT
Link Posted: 3/28/2009 6:43:09 PM EDT


You've got a multimeter and a wiring diagram, where do you start?[/quote]


In my box there is more than a multimeter. I would get out the scaner and the scope and go from there.

Link Posted: 3/28/2009 6:44:39 PM EDT
[Last Edit: 3/28/2009 6:47:27 PM EDT by Quintin]
Link Posted: 3/28/2009 6:44:48 PM EDT
Are you a tech, or you just looking for advise?
Link Posted: 3/28/2009 6:46:24 PM EDT
Link Posted: 3/28/2009 6:46:26 PM EDT
What is the motor's resistance/impedence, disconnected from the ABS control unit?

I believe the motor may be at fault.
Link Posted: 3/28/2009 6:47:46 PM EDT
Originally Posted By Quintin:
Originally Posted By HighVoltage1115:
Are you a tech, or you just looking for advise?


I'm a tech.

It originated a while back during a spirited thread, where some folks deemed that working on cars was a piece of cake, and no tech was worth more than like ten bucks an hour or whatever, which I disagree with, so I figure I'd put some stuff together from my daily routine and let other guys walk through and find the problem.


You are Dr. Greg House of the automotive world. And we are but your students. Although I don't know which one I am...
Link Posted: 3/28/2009 6:48:24 PM EDT
Originally Posted By Quintin:
Originally Posted By HighVoltage1115:
Are you a tech, or you just looking for advise?


I'm a tech.

It originated a while back during a spirited thread, where some folks deemed that working on cars was a piece of cake, and no tech was worth more than like ten bucks an hour or whatever, which I disagree with, so I figure I'd put some stuff together from my daily routine and let other guys walk through and find the problem.


Sorry I'm a dumbass. I just noticed the diagram was off of dealerconnection

Link Posted: 3/28/2009 6:48:37 PM EDT
[Last Edit: 3/28/2009 6:49:41 PM EDT by Keith_J]
xxxdupexxx
Link Posted: 3/28/2009 6:49:14 PM EDT
Link Posted: 3/28/2009 6:50:03 PM EDT
Link Posted: 3/28/2009 6:50:46 PM EDT

Originally Posted By Quintin:
Originally Posted By HighVoltage1115:
Are you a tech, or you just looking for advise?


I'm a tech.

It originated a while back during a spirited thread, where some folks deemed that working on cars was a piece of cake, and no tech was worth more than like ten bucks an hour or whatever, which I disagree with, so I figure I'd put some stuff together from my daily routine and let other guys walk through and find the problem.


That may have been how it started and what motivated it originally, but it's now elevated to my favorite arfcom threads. I look forward to each and everyone of these. I hope nobody answers it until I've sobered up tommorow.
Link Posted: 3/28/2009 6:51:01 PM EDT
[
ETA - Any Ford techs who've dealt with Ford technical assistance probably knows what tool I'm talking about.


I only work on GM's so i dunno what tool you are talking about
Link Posted: 3/28/2009 6:51:55 PM EDT
Well, then, if it isn't power or motor and all wheel sensors are working, then it must be the controller.
Link Posted: 3/28/2009 6:52:42 PM EDT
Link Posted: 3/28/2009 6:52:57 PM EDT
I would start at the flux capacitor
Link Posted: 3/28/2009 6:53:04 PM EDT
Crimped brakeline causing a sensor to go apeshit and not see sufficient pump pressure ?
Link Posted: 3/28/2009 6:53:21 PM EDT
Link Posted: 3/28/2009 6:54:18 PM EDT
Link Posted: 3/28/2009 6:55:07 PM EDT
Originally Posted By Quintin:
Originally Posted By HighVoltage1115:
[
ETA - Any Ford techs who've dealt with Ford technical assistance probably knows what tool I'm talking about.


I only work on GM's so i dunno what tool you are talking about


You've got way more patience than I do, working with GM stuff. I've dealt with Trail Blazers from time to time, I think I'm scarred for life on 'em.



GM's are not that bad.. They do some stupid shit from time to time but so does everyone elese
Link Posted: 3/28/2009 6:56:24 PM EDT
Link Posted: 3/28/2009 6:57:23 PM EDT
Voltage drop across all wires? are all the ground s good?
Link Posted: 3/28/2009 6:58:13 PM EDT
Originally Posted By Quintin:
Originally Posted By HighVoltage1115:
Originally Posted By Quintin:
Originally Posted By HighVoltage1115:
[
ETA - Any Ford techs who've dealt with Ford technical assistance probably knows what tool I'm talking about.


I only work on GM's so i dunno what tool you are talking about


You've got way more patience than I do, working with GM stuff. I've dealt with Trail Blazers from time to time, I think I'm scarred for life on 'em.



GM's are not that bad.. They do some stupid shit from time to time but so does everyone elese


Yeah, they ain't too bad for someone who deals with them on a daily basis. I can futz and fight my way through one, but I still look like a monkey humping a football, ya know? It's different when you work on a particular brand/model day in and day out.


Thats the way I look at Fords
Link Posted: 3/28/2009 6:58:35 PM EDT
Must be electrical connections. Any corrosion/dirt?
Link Posted: 3/28/2009 6:59:45 PM EDT
Link Posted: 3/28/2009 7:00:20 PM EDT
Link Posted: 3/28/2009 7:01:47 PM EDT
[Last Edit: 3/28/2009 7:07:49 PM EDT by Pthfndr]
With no other information I would check the battery voltage inputs to the ABS control unit, and the grounds. But from what I can tell there are no grounds in that schematic!

Any chance you can make the image a little bigger?

Holy crap, when I first clicked on this there were no other posts. Got caught up reading something else, came back to it and there's a bunch of replies.
Link Posted: 3/28/2009 7:01:55 PM EDT
Link Posted: 3/28/2009 7:03:40 PM EDT
Link Posted: 3/28/2009 7:07:08 PM EDT
The tool is black electrical tape.......To cover up the idiot light on the dash.....Fucking computers!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Link Posted: 3/28/2009 7:07:50 PM EDT
Is the motor siezed ? is it a brushless motor ?
Link Posted: 3/28/2009 7:07:51 PM EDT
Originally Posted By Quintin:
Another tech in the shop loaned you a tool to check this truck out.

http://i32.photobucket.com/albums/d1/DBNissan/Tech/0cb56322.jpg

It's got a 3157 bulb in it.


What does the repair manual say about this tool? Some of us are not FoMoCo trained...it has been 8 years since I've touched one
Link Posted: 3/28/2009 7:08:15 PM EDT
Link Posted: 3/28/2009 7:09:25 PM EDT
Link Posted: 3/28/2009 7:09:31 PM EDT
Originally Posted By wasnme:
Is the motor siezed ? is it a brushless motor ?


Two wires? Not a brushless. Single speed brush type.
Link Posted: 3/28/2009 7:09:38 PM EDT
Is that lamp holder being used instead of a test light or is the a reason to use a 3157 lamp?
Link Posted: 3/28/2009 7:10:20 PM EDT
Link Posted: 3/28/2009 7:11:00 PM EDT
Originally Posted By Quintin:
Originally Posted By wasnme:
Is the motor siezed ? is it a brushless motor ?


Well, I dunno. Let's apply power and ground from the battery directly to the motor and see.

Huzzah - the motor runs. So, we know the ABS pump isn't at fault. But yet, we have power and ground to the pump. Hmmm...


power and ground, but no signal. right?
Link Posted: 3/28/2009 7:11:34 PM EDT
Link Posted: 3/28/2009 7:12:10 PM EDT
Originally Posted By Quintin:
Originally Posted By wasnme:
I always start with the simplest explanation , the fuses , then I check the pump to see if it's actually working , work backward from there .

Is there a maintenence switch in the circut ? I know there was a 3 position switch on one car I worked on , the light would come on at certain intervals and wouldn't go out till the mechanic (me) inspected the system and flipped the switch hidden up under the dash . older BMW's had a little rig the mechanic had to reset the computer with . Anything like that going on here perhaps ?


Okay. You checked and verified, fuses 6 and 28 in the battery junction box are not open and there is power at them, likewise with fuses 11 and 14 at the central junction box.

In the scan tool, there is a test called active commands, where we can use the scan tool to command the ABS pump on. Doing this, the pump does not run.

There's no switches or electrical trickery here either.


Connect a bulb and socket across the output of the controller going to the motor and command the pump on, if the bulb lights, the pump is bad, if the bulb does not light, the controller is bad.
Link Posted: 3/28/2009 7:12:33 PM EDT
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